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The reactive Postgres client
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/*
 * Copyright (C) 2017 Julien Viet
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package io.reactiverse.pgclient.impl;

import io.reactiverse.pgclient.*;
import io.vertx.core.*;

/**
 * @author Julien Viet
 */
public class PgConnectionImpl extends PgClientBase implements PgConnection, Connection.Holder {

  private final Context context;
  public final Connection conn;
  private volatile Handler exceptionHandler;
  private volatile Handler closeHandler;
  private Transaction tx;
  private volatile Handler notificationHandler;

  public PgConnectionImpl(Context context, Connection conn) {
    this.context = context;
    this.conn = conn;
  }

  @Override
  public Connection connection() {
    return conn;
  }

  @Override
  public void handleClosed() {
    Handler handler = closeHandler;
    if (handler != null) {
      context.runOnContext(handler);
    }
  }

  @Override
  protected void schedule(CommandBase cmd) {
    Context current = Vertx.currentContext();
    if (current == context) {
      if (tx != null) {
        tx.schedule(cmd);
      } else {
        conn.schedule(cmd);
      }
    } else {
      context.runOnContext(v -> {
        schedule(cmd);
      });
    }
  }

  @Override
  public void handleException(Throwable err) {
    Handler handler = exceptionHandler;
    if (handler != null) {
      context.runOnContext(v -> {
        handler.handle(err);
      });
    } else {
      err.printStackTrace();
    }
  }

  @Override
  public boolean isSSL() {
    return conn.isSsl();
  }

  @Override
  public PgConnection closeHandler(Handler handler) {
    closeHandler = handler;
    return this;
  }

  @Override
  public PgConnection notificationHandler(Handler handler) {
    notificationHandler = handler;
    return this;
  }

  @Override
  public PgConnection exceptionHandler(Handler handler) {
    exceptionHandler = handler;
    return this;
  }

  @Override
  public PgTransaction begin() {
    return begin(false);
  }

  PgTransaction begin(boolean closeOnEnd) {
    if (tx != null) {
      throw new IllegalStateException();
    }
    tx = new Transaction(context, conn, v -> {
      tx = null;
      if (closeOnEnd) {
        close();
      }
    });
    return tx;
  }

  public void handleNotification(int processId, String channel, String payload) {
    Handler handler = notificationHandler;
    if (handler != null) {
      handler.handle(new PgNotification().setProcessId(processId).setChannel(channel).setPayload(payload));
    }
  }

  @Override
  public void close() {
    if (tx != null) {
      tx.rollback(ar -> conn.close(this));
      tx = null;
    } else {
      conn.close(this);
    }
  }

  @Override
  public PgConnection prepare(String sql, Handler> handler) {
    schedule(new PrepareStatementCommand(sql, ar -> {
      if (ar.succeeded()) {
        handler.handle(Future.succeededFuture(new PgPreparedQueryImpl(conn, ar.result())));
      } else {
        handler.handle(Future.failedFuture(ar.cause()));
      }
    }));
    return this;
  }
}